可是

It is strange, and yet it is true.

是奇怪, 是真的。

However, Bassy did not even touch the hook.

是，巴斯并没有碰到鱼钩。

They tried artificial respiration but it was of no avail.

他试做人工呼吸,是无效。

The play was a tragedy, but the acting was laughable.

戏是悲剧,是演得却令人发笑。

They pretend to be so right-on, but are they really?

他假装关心时事，是是真的吗？

She’s only fourteen, but she swears like a trooper.

她只有十四岁，是满嘴脏话。

He is intelligent, to be sure, but he’s also very lazy.

他固然聪明， 是也很懒惰。

He strained every sinew to help us, but didn’t succeed.

他尽全力帮助我,是没有成功。

We drove past a signpost I couldn’t read.

我驶过一块路标, 是我读不懂。

I had a stab at fishing once but I found it boring.

我曾尝试过钓鱼，是发现很枯燥。

We’ve bent over backwards to help the child, but she refuses to cooperate.

我尽力要帮助这个女孩，是她拒绝合作。

Their hands blistered, but no one complained.

他手起了泡, 是没有一个人有怨言。

The man lashed the donkey but it would not go any faster.

这人用鞭子抽驴，是它再也跑不快了。

They made a belated attempt to save her life.

他力图挽救她的生命,是已经太迟了。

The morning began fine, but now clouds are banking up.

早晨开始是, 是现在乌云密布。

Here's the glove for my left hand but where's the companion?

这里是我左手的手套是右手的在哪里呢?

Who do you admire most? That's a toughie.

你最钦佩的人是谁？这是个难题。

It was only a small gift but Phil was as pleased as anything with it.

只是一件小礼物，是菲尔高兴得跟什么似的。

Her lectures are very useful, but they’re dry as dust.

她讲的课很有用，是却乏味得要死。

I have keyed this sentence three times, and it's still wrong!

我把这个句子输入了三次, 是仍然不对。